Despite the words used, the phrase "OOH KILL EM'" is used as an expression of excitement, accomplishment, amazement etc. The phrase became famous from a Vine video that depicts a young black boy named "Terio" who is dancing and the guy filming him precedes to say, "OOH...OOH! OOH KILL EM'! OOH KILL EM'!" The expression is also featured in an instrumental titled "OOH KILL EM'" produced by Rcm2 where the phrase is the drop of the song and is repeated multiple times in the chorus. A very good heavy trap style beat is you ask me.